A. 求英语语法虚拟语气例句
与袭..事实相反
If从句
主句
过去
Had
done
Would*
have
done
现在
Were/did
Would*
do
将来
Should
do/were/were
to
do
Would*
do
例句：If
there
hadn’t
been
much
rain
in
spring,
we
would
have
had
a
good
harvest
now.
[过去]
If
he
smoked
less,
his
cough
might
be
well
soon.
[现在]
If
the
lecturer
should
be
late,
you
would
have
to
make
a
speech
first.
[将来]
B. 英语语法及例句
语言要遵循一定的规则，这种规则即被我们称之为“语法”。许多学生在英语学习中一听“语法”头就大，产生恐惧、厌学的心理。教师要遵循“精讲多练，讲练结合，以练为主”的教学方法，同时还要注意提高学习效率，减轻学生的作业负担，实现语言为交流工具的目的。笔者在多年的教学实践中总结：语法教学要重视例句的选择。
一、代表性
例句的选择在结构上要有代表性，起到掌握这个句型就能够举一反三的作用。历年的高考试题、学生比较熟悉的经典习题等，我们不妨拿来一试。
如，讲动词不定式的主动式和被动式：
She went to the ball not only to see,but also to be seen.(她去参加舞会不仅为了见见世面。也为了出出风头。）
如with复合结构，即with+宾语+宾语补足语：
With two exams to worry about,I have to work really hard this weekend.(2004,北京）
关于情态动词must have done 表对过去情况肯定的猜测：
I have lost one of my gloves. I must have dropped it somewhere. (2005,北京）
二、简洁性
有些教师认为，例句越难越好，难的会了容易的就更会了；还有教师因为学生上课不好好听课，主张选难懂的句子来镇镇他们。其实不然。正如人的认知规律“由易到难”，对于语法学习有困难的学生而言，复杂的例句只会让他们更头痛，对语法更畏惧，对英语学习更没兴趣。选择结构简洁的例句，语言上通俗易懂，读来朗朗上口，学生容易记，也记得牢。
如讲动词不定式的语法功能时:
1.
He is always the first to come and the last to leave.(to do 不定式作定语，修饰序数词)
2.
To see is to believe.(to do 不定式坐主语和表语)
对比学习Seeing is believing.(动名词作主语和表语)
3.
It is easier to say something than to do something. (to do 不定式作句子的真正主语，It为形式主语)
对比学习It is easier said than done.
三、趣味性
兴趣是产生学习激情的巨大动力。选择内容生动有趣的例句，如谚语、成语、俚语等，这样学生有了兴趣，就愿意多念，念熟了就能由次及彼。
如： 倒装结构“so+助动词+主语+谓语+------”：
As a man lives,so shall he dies.(有生就有死)
As a man sows, so shall he reap.(种瓜得瓜。种豆得豆)
下边还有一个比较级的句子：
The old man was not any more fond of being read to than the old woman.
此句的翻译为“那个老头和老太太一样，都喜欢别人读书给他们听”。有学生将它译为“那个老头不喜欢别人给他念书，就喜欢哪个老太太”，这就要闹笑话了。
四、积极性
选择一些内容积极向上的语法例句，如名言警句等。这不仅能让学生掌握相应的语法知识，同时也起到教育的情感目的，起到教育人的作用。
One half of knowing what you want is knowing what you must give up before you get it.
知道想要什么，一半在于知道得到它之前必须放弃什么。 （表语从句）
Victory will not come to me unless I go to it. 胜利是不会向我走来的，我必须自己走向胜利。 （条件状语从句）
All that litters is not gold. 闪光的并非都是金子。 （定语从句）
五、综合性
在实际的语法教学中，很少有独立的语法项目，很多时候许多的语法知识汇集在一个句中。选择综合性较强的例句来讲解，让学生背诵，能起到事半功倍的效果。如：
It was playing computer games that cost the boy much time he ought to have spent in doing his lessons.
这个例句综合了：
强调句型：It was---that---
定语从句：---time (that) he ought to have---lessons
情态动词：ought to have spent---
动名词作主语：---playing computer games cost the boy much more time---
总之，适当的例句选择不仅能够让学生理解语法，掌握重点，还能在茫茫题海中减轻学生大量背诵和大量习题的课业负担，有效提高教学质量。教师要注意多研究，多积累，找出更多的语法教学方法。
C. 一些常用的英语单词，语法，句子，越多越好
组成句子的各个部分叫句子成分。英语句子成分有主语，谓语，表语，宾语，宾语补足语，定语，状语等。 顺序一般是主语，谓语，宾语，宾语补足语，而表语，定语，状语的位置要根据情况而定。 1、主语 主语表示句子主要说明的人或事物，一般由名词，代词，数词，不定式等充当。 Helikeswatch'ingTV.他喜欢看电视。 2、谓语 谓语说明主语的动作，状态或特征。 一般可分为两类： 1)，简单谓语 由动词(或短语动词)构成。 可以有不同的时态，语态和语气。 Westud'yforthepeo'ple.我们为人民学习。 2)，复合谓语：情态动词＋不定式 Icanspeakalit'tleEng'lish.我可以说一点英语。 3、表语 表语是谓语的一部分，它位于系动词如be之后，说明主语身份，特征，属性或状态。一般由名词，代词，形容词，副词，不定式，介词短语等充当。 Mysis'terisanurse.我姐姐是护士。 4、宾语 宾语表示动作行为的对象，跟在及物动词之后，能作宾语的有名词，代词，数词，动词不定式等。 WelikeEng'lish.我们喜欢英语。 有些及物动词可以带两个宾语，往往一个指人，一个指物，指人的叫间接宾语，指物的叫直接宾语。 Hegavemesom'eink.他给了我一点墨水。 有些及物动词的宾语后面还需要有一个补足语，意思才完整，宾语和它的补足语构成复合宾语。如： Wemakehimourmon'itor.我们选他当班长。 5、定语 在句中修饰名词或代词的成分叫定语。 用作定语的主要是形容词，代词，数词，名词，副词，动词不定式，介词短语等。形容词，代词，数词，名词等作定语时，通常放在被修饰的词前面。 Heisanewstu'dent.他是个新生。 但副词，动词不定式，介词短语等作定语时，则放在被修饰的词之后。 Thebikeintheroomismine.房间里的自行车是我的。 6、状语 修饰动词，形容词，副词以及全句的句子成分，叫做状语。用作状语的通常是副词，介词短语，不定式和从句等。状语一般放在被修饰的词之后或放在句尾。副词作状语时可放在被修饰的词前或句首。 HelivesinLon'don.他住在伦敦。 7.补语 用来说明宾语或主语所处的状态或正在进行的动作，因为英语中有些动词加宾语后意思仍然不完整，如：make(使...),ask(请)等等。如果我们说：我们使我们的祖国。这不是一句完整的话。应该说：我们使我们的祖国更美丽。这是的“美丽的（beautiful)”为形容词做补语，说明祖国的状态。英语句子为:We will make our country more beautiful.作补语的词或词组为：形容词，副词，名词，不定式，ing形式，数词等。 8.宾补 就是宾语补足语，就是补充说明宾语的 例：I know you are student good at maths 在这个句子中，good at maths 就是补语。 宾语补语也可以是句子，所以这个句子也可以是： I know you are student who is good at maths 还可以是-ing 形式 I see you crossing the street 简单说就是补充和说明主语和宾语的成分.因此,就出现了主语补足语和宾语补足语.上面两位举的例子都不错.只是热雪冰冷的宾补的句子例子不是很恰当哦.他的例子是定语从句 啊 还有 主语补足语可以是表语 例如:Tom is a student.student是对Tom的解释与说明. 另外,Tom was seen playing on the playground.这个句子中playing是对Tom的解释说明 是主补
D. 英语语法点三十个有例句，谢谢
以下三十个句子的语法内容包含虚拟语气、强调句型、定语从句、it做形式主语、非谓语动词等等。 在读句子时 要注意这些语法内容的运用， 最好把句子中的重点单词全部掌握住！
1. If the rules of perspective had not been discovered, no one would have been able to paint such realistic pictures.如果没有发现透视法,人们就不可能画出如此逼真的画。
2. Without the new paints and the new technique, we would not be able to see the many great masterpieces for which this period is famous.没有新的颜料和新的(绘画)手法，我们就不能看到很多使这一时代著名的杰作。
3. Among the painters who broke away from the traditional style of paining were the Impressionists，who lived and worked in Paris.在那些突破传统画法的画家中，有生活和工作在法国巴黎的印象派画家。
4. At the time they were created，the Impressionist paintings were controversial，but today they are accepted as the beginning of what we call "modern art".
在印象派作品的创建初期,它们是存在着争议的,但是如今己被人们接受而成为现在我们所说的"现代艺术"的始祖了。
5. You can also explore Frick's beautiful home and garden which are well worth a visit.
你还可以好好考察一下弗里克美丽的故居和花园，它们是很值得一看的。
6. When you walk into the gallery, you feel as if you were inside a fragile, white seashell. 当你走进画廊的时候，你会觉得你进入了一个易碎的白色贝壳之中。
7. It is amazing that so many great works of art from the late 19th century to the 21st century are housed in the same museum. 令人惊奇的是，在同一家博物馆里竟能容纳下19世纪后期到21世纪的如此众多的名家巨作。
8. There are various reasons why people write poetry. 人们写诗有着各种各样的理由。
9. The language is concrete but imaginative, and they delight small children because they rhyme, have strong rhythm and a lot of repetition.（童谣的）语言具体但富有想象力，这能使小孩子们快乐，因为它们押韵，节奏感强,并较多重复。
10. By playing with the words in nursery rhymes, children learn about language.
通过童谣中的文字游戏，孩子们学习了语言。
11. Another simple form of poem that students can easily write is the cinquain, a poem made up of five lines. 另外一种学生容易写的简体诗是由五行组成的,叫做五行诗。
12. With so many different forms of poetry to choose from，students may eventually want to write poems of their own. 有了这么多可供选择的诗歌类型,学生们最终也许想自己作诗了。
13. I think my long and active life must be e to the healthy life I live. 我想我之所以长寿而且精力充沛,要归功于我的健康生活。
14. First, you can become physically addicted to nicotine, which is one of the hundreds of chemicals in cigarettes.首先,你会在身体上对尼古丁有瘾，它是香烟里几百种化学物质之一。
15. I didn't know, for example, that it could do terrible damage to your heart and lungs or that it was more difficult for smoking couples to become pregnant.
例如，我不知道抽烟能严重侵害人的心脏和肺部，也不知道吸烟的夫妇生育能力会下降。
16. It isn't easy to stop smoking, but millions have managed to quit and so can you.
戒烟不容易，但许许多多的人都成功地戒掉了烟，所以你也能戒烟。
17. Every time you feel like smoking a cigarette, remind yourself that you are a non-smoker.
每当你想要吸烟的时候,你就提醒你自己,你(已经)是不吸烟的人了。
18. It is only when the disease has progressed to AIDS that a person beginsto look sick. 只有当这种病毒发展成艾滋病时,人才会显出病态。
19. All scientists subscribe to the view that the increase in the earth's temperature is e to the burning of fossil fuels like coal, natural gas and oil to proce energy.
所有的科学家赞同这种观点：人们为了生产能量而燃烧化石燃料如煤、天然气和石油，从而引起了地球温度的升高。
20. It means that more heat energy tends to be trapped in the atmosphere causing the global temperature to go up. 这意味着更多的热量被困在大气层中，从而引起全球温度上升。
21. It was a scientist called Charles Keeling, who made accurate measurements of the amount of carbon dioxide in the atmosphere from 1957 to 1997. 是一位名叫查尔斯·基林的科学家曾经把1957-1997年期间大气层中二氧化碳的含量作了精确的统计。
22. They also agree that it is the burning of more and more fossil fuels that has resulted in this increase in carbon dioxide. 他们还赞同下述观点，正是燃烧越来越多的化石燃料导致了二氧化碳的增加。
23. On the other hand, there are those, like George Hambley, who are opposed to this view, believe that we should not worry about high levels of carbondioxide in the air.
另一方面，还有一些人，像科学家乔治·汉布利，反对上面的观点，他们认为我们不必担心空气中会有高含量的二氧化碳。
24. It's OK to leave an electrical appliance on so long as you are using it — if not, turn it off! 在用电器设备时你可以让它开着，如果不用就把它关掉!
25. Having collected and evaluated the information, I help other scientists to predict where lava from the volcano will flow next and how fast.
收集和评估了这些信息之后，我就帮助其他科学家一起预测下次火山熔岩将往何处流去，流速是多少。
26. I was about to go back to sleep when suddenly my bedroom became as bright as day. 我刚要再睡,突然我的卧室亮如白昼。
27. Having studied volcanoes now for many years, I am still amazed at their beauty as well as their potential to cause great damage.
虽然我从事火山研究很多年了,但是我对火山的壮丽景色以及它那潜在的巨大破坏力至今仍然感到惊愕不已。
28. The height of the land varies from 700 metres above sea level to over 2,000 metres and is home to a great diversity of rare plants and animals.
这里地面的高度从海拔700米到2000多米不等,是多种多样稀有动植物的生长地。
29. When you arrive you are rewarded not only with the sight of its clear waters, but also by the view of the other sixteen mountain peaks that surround Tianchi.
你一到达山顶就会得到回报一一你不仅可以看到天池那清澈如镜的湖水，而且还可以看到天池四周的16座山峰。
30. It is said that this boy, who had a great gift for language and persuasion, is the father of the Manchu people. 据说这个男孩就是满族人的祖先，具有语言天赋和很强的说服力。
E. 如何学好英语语法。写出优美的句子
学好语法只能做到句子准确没有语病,但要写出优美的句子还得靠平时多读,多看,多积累,对语言的积累达到一定程度,才有可能实现,不要急啊
F. 英语 语法 句子
because引导的是前面主句的状语从句，不是后面宾语从句的状语从句
G. 英语语法 被动 例句
should have been given the job
been showed what to do
H. 一个英语例句的语法。
Yet副词作状语表示转折，意思是然而。I’d sit = I would sit 表示过去一段时间习惯的动作。sweating... 现在分词作伴随状语，逻辑主语是句子的主语 I。
I. 英语的时态语法（所有）+例句
1. 现在一般时与现在完成时
1) I come from Shanghai(上海人）
I have come from Shanghai（从上海来）
2) You read very well. (强调能力）
You've read very well. （强调一次刚完成的动作）
3) I forget.(一时想不起来了）
I have forgotten.（仍没想起来，可能已回忆起来了）
4) The book is written in simple English. (表状态）
The book has been written in simple English.（表动态，已用英语写成）
5) Every time I see him, he's been reading. （两个动作不可能同时进行）Every time I have seen him, he's been reading. (强调两个动作同时进行）
6) He is gone. (强调状态）He has gone （强调动作和时间）
7) He won't come till the play begins. (演出开始时）
He won't come till the play has begun.（戏已开始）
8) After I leave school, I'll go to college. （两个动作紧密相接）
After I have left school, I'll go to college.（强调毕业后，两个动作可能有间隔）
9) It is a long time since I saw you last. It's been a long time since I saw you last.(这两句话一样，后一句是美国英语）
10) Where are you? (在哪）Where have you been?(去了哪）
2. 现在一般时与现在进行时
1) He works hard.（强调始终如一）He is working hard.（强调现在）
2) What do you do? (干什么工作的）What are you doing?（在干什么）
3) Here comes the bus! (表高兴和欣慰）
The bus is coming.（汽车到来的情景）
4) I forget him name. I'm forgetting his name.(差点把他的名字忘了）
5) You don't eat much. (强调胃口不大）
You're not eating much.（你怎么不吃呀）
6) The match starts at 7 o'clock. (比较固定，不宜改变）
The match is starting at 7 o'clock.（可以改变）
7) Tom always comes late. Tom is always coming late.(表示不满，责备）
8)Tom goes to college now.
Tom is going to college now.(这两句区别不大，后者更生动）
9） I tell you.（我可以告诉你）
I'm telling you.(我告诉你吧，有感情色彩）
10) He always sleeps in the afternoon.
He is always sleeping in the afternoon.(后者意味着整个下午都睡掉了）
11) I expect you to phone me. ( 几乎等于命令）
I'm expecting you to phone me.（婉转）
12) What do you say? What are you saying?(你说些什么呀，表说话人惊讶，不满）
12) I find that the book is too difficult for me.(强调结果） I'm finding that the book is too difficult for me. (强调过程，逐渐感到）
13) Apples cost more these days.(强调事实)
Apples are costing more these days.(越来越贵)
14) He always thinks of others.
He's always thinking of others.(表示赞扬)
15) Whenever I see him, he argues with somebody.(强调两个动作有先后) Whenever I see him, he is arguing with somebody.(强调两个动作同时进行)
16) I hope you'll give us some advice.
I'm hoping you'll give us some advice.(表示语气婉转)
17) I must go. (我应该去)I must be going.(我该走了)
18) We can discuss this while we eat.(说话是没用餐)
We can discuss this while we are eating.(进餐已开始)
3. 现在完成时与过去一般时
1) I've seen him this morning.(还在上午的时间里)
I saw him this morning.(时间已不在上午了)
2) Who's opened the window? (窗户还在开着)
Who opened the window? (与现在无关,窗户可能已关上)
3) Have you ever heard him sing? (他可能不是爱唱歌)
Did you ever hear him sing?(你曾听过他唱歌吗,他可能是歌唱家)
4) Have you ever heard of such a thing? (你听过这种事吗)
Did you ever hear of such a thing?(这种事, 你听说过吗? 是一个修辞性问题，表示惊异。)
5) What have I done to make you so angry? (对方仍生气）
What did I do to make you so angry? （暗示某一过去的时间，可能对方已不生气了。）
6) How has he done it? (他这活干的怎么样？强调结果）
How did he do it?（他是怎么干这活的？强调干活的方式）
7) He has lived in New York for eight years. (他仍在纽约）
He lived in New York for eight years.（他可能不在人世了）
8) He has been called a thinker.
He was called a thinker.(他曾被誉为思想家）
9) You've heard what I said. (你听见我的话了）
You heard what I said.（你是听见我的话的，口气严厉，具有感情色彩。）
10) I've lost my pen. (笔还没找到）I lost my pen.（笔可能找到了）
11) He has already been there. (曾去过哪）
He was already there.（当时在哪）
12) Since I have been ill, my friend has visited me every day.（生病还在延续）Since I was ill, my friend has visited me every day. (病已好了）
13) Have you slept well? (暗示疲倦了，休息后是否好些了）
Did you sleep well?（暗示睡的是否舒服，满意）
4. 过去完成时与过去一般时
1) I came here after I finished middle school.(两个动作每间隔)
I came here after I had finished middle school.(两个动作有间隔,强调先后概念)
2) I waited till I saw him.
I waited till I had seen him. (这两个句子差不多,过去完成时更普遍)
3) We hoped he would come.(我们希望他来)
We had hoped he would come.(我们本希望他来的)
4) I don't think he sang as well as he once did.(指具体一次)
I don't think he sang as well as he had once done.(泛指以前,现在可能不唱了)
5) Before I came here, I was a soldier.(我来此以前在当兵)
Before I came here, I had been a soldier.(我来此以前,曾当过兵)
6) Jim said he didn't know he was so strong.(表示Jim在说话时仍很结实) Jim said he didn't know he had been so strong.(表示在Jim说话之前曾结实过)
7) They were friends from many years.(表示现在还是朋友)
They had been friends for many years.(意味这友谊结束了)
8) He did the work at 6.(强调时间)
He had done the work at 6. (6点工作已做完)
9) I learned French ring my holiday.(强调学了)
I had learned French ring my holiday. (强调学会了)
10) When she sang she sat down.(表示唱着坐下)
When she had sung she sat down.(表示唱完坐下)
11) I went to bed when I did my homework.(不明确)
I went to bed when I had done my homework.(作业做完)
12) I have lived here since I was a child.(从我长大成人)
I have lived here since I had a child.(从我孩提时)
5. 过去进行时与过去一般时
1) I read a book yesterday. (书已看完)
I was reading a book yesterday.(书尚未看完)
2) The guests arrived.(客人已到)
The guests were arriving.(客人陆续到达)
3) He woke from a dream. (表示全醒)
He was waking from a dream.(表示初醒)
4) The old man died.(已死) The old man was dying.(要死)
5) John told me about it.(告诉我了,我都知道了)
John was telling me about it.(跟我谈起过,我想了解更多的事情)
6) They persuaded me to go along with them.(已经说服)
They were persuading me to go along with them.(还在劝说)
7) The wind blew hard all night.(强调事实)
The wind was blowing hard all night.(强调风刮个不停)
8) I expected you. I was expecting you.(客气,表示可能等了很旧了)
9) He knocked at the door.(强调一次性)
He was knocking at the door.(强调多次性)
6. 将来一般时与现在进行时
1) Will he come? Is he coming?(时间发生的比较近)
2) How long will you stay hear? (表示意愿)
How long will you stay here?(表示打算)
3) She'll have a baby. (表示肯定)
She's going to have a baby.(表示推测,计划)
4) I'll see him this evening.(表示意愿)
I'm seeing him this evening.(表示打算,已有安排)
7. 现在一般时与过去一般式
1) Do you wish to see me?
Did you wish to see me?(表示婉转客气)
2) That's all I have to say.(我的话就这些)
That's all I had to say.(我要说的就这些)
3) How do you like the film? (看电影过程中)
How did you like the film?(看完电影后)
4) It is nice to see you.(见面时说)
It was so nice to see you.(离别时说)
5) I never like him. (没时间性)
I never liked him.(从来没喜欢过)
6) I think I know that voice.(没见客人时)
I thought I know that voice.(见到客人时,证明自己正确或错误)
7) Who is that? (哪人还在)
Who was that?(人已不在场了)
8) This cake is made at home. (家里常做这种蛋糕)
This cake was made at home.(这种蛋糕是自家做的)
8.现在完成时与现在完成进行时
1) Someone has phoned you.(打了电话)
Someone has been phoning you.(一直在打电话)
2) I've read the novel.(已读完)
I've been reading the novel.(还没读完)
3) He has lived here for six weeks.
e has been living here for six weeks. (区别不大,后者更口语化)
4) Have you met her lately?
Have you been meeting her lately?(强调动作的重复,经常见面)
5) Who's eaten my apples? ( 苹果没有了)
Who's been eating my apples?(有感情色彩,表示愤怒不满)
9.现在一般时与过去完成时
1) I hope that he'll come.
I had hoped he would come.(与事实相反)
(经常这样用的词有:expect, think, intend, mean, suppose)
J. 求英语各种语法形式的例句
状语从句1.地点状语从句
地点状语从句通常由where, wherever 引导。例如：
Where I live there are plenty of trees. 我住的地方树很多。
Wherever I am I will be thinking of you. 不管我在哪里我都会想到你。 2.方式状语从句
方式状语从句通常由as, （just） as…so…, as if, as though引导。
1）as, （just） as…so…引导的方式状语从句通常位于主句后，但在（just） as…so…结构中位于句首，这时as从句带有比喻的含义，意思是"正如…"，"就像"，多用于正式文体。例如： Always do to the others as you would be done by. 你希望人家怎样待你，你就要怎样待人。
As water is to fish, so air is to man. 我们离不开空气，犹如鱼儿离不开水。
Just as we sweep our rooms, so we should sweep backward ideas from our minds.
正如打扫房屋一样，我们也要扫除我们头脑中落后的东西。
2）as if, as though
两者的意义和用法相同，引出的状语从句谓语多用虚拟语气，表示与事实相反，有时也用陈述语气，表示所说情况是事实或实现的可能性较大。汉译常作"仿佛……似的"，"好像……似的"。例如：They completely ignore these facts as if （as though） they never existed. 他们完全忽略了这些事实，就仿佛它不存在似的。（与事实相反，谓语用虚拟语气。）
He looks as if （as though） he had been hit by lighting. 他那样子就像被雷击了似的。（与事实相反，谓语用虚拟语气。）
It looks as if the weather may pick up very soon. 看来天气很快就会好起来。（实现的可能性较大，谓语用陈述语气。）
说明：as if / as though也可以引导一个分词短语、不定式短语或无动词短语。例如：
He stared at me as if seeing me for first time. 他目不转睛地看着我，就像第一次看见我似的。
He cleared his throat as if to say something. 他清了清嗓子，像要说什么似的。
The waves dashed on the rocks as if in anger. 波涛冲击着岩石，好像很愤怒 3.原因状语从句
比较because, since, as和for：
1）because语势最强，用来说明人所不知的原因，回答why提出的问题。当原因是显而易见的或已为人们所知，就用as或 since。例如：
I didn't go, because I was afraid. 我不去是因为我怕。
Since /As the weather is so bad, we have to delay our journey. 天气那么糟，旅行推迟了。
2）由because引导的从句如果放在句末，且前面有逗号，则可以用for来代替。但如果不是说明直接原因，而是多种情况加以推断，就只能用for。例如：
He is absent today, because / for he is ill. 他今天缺席，因为他病了。
He must be ill, for he is absent today. 他一定病了，所以今天缺席。4.目的状语从句
表示目的状语的从句可以由that, so that, in order that, lest, for fear that, in case等词引导。例如：You must speak louder so that /in order that you can be heard by all. 你必须大点声，别人就能听见了。
He wrote the name down for fear that（lest） he should forget it. 他写下了这个名字以免以后忘记。
Better take more clothes in case the weather is cold. 最好多穿点衣服，以防天发冷。5.结果状语从句
结果状语从句常由so…that 或 such…that引导。so…that与such…that之间可以转换。例如：
The boy is so young that he can't go to school. 这男孩年龄太小，不能上学。
He is such a young boy that he can't go to school 6. 条件状语从句
连接词主要有 if, unless, as/so long as, on condition that 等。if 引导的条件句有真实条件句和非真实条件句两种。非真实条件句已在虚拟语气中阐述。 unless = if not. 例如：
Let's go out for a walk unless you are too tired. 如果不太累，我们去散散步。
If you are not too tied, let's go out for a walk.
典型例题
You will be late ___ you leave immediately.
A. unless B. until C. ifD. or
答案A。句意：除非你立即走，否则你就回迟到的。可转化为 If you dong leave immediately, you will be late。B、D句意不对，or表转折，句子如为 You leave immediately or you will be late. 7. 让步状语从句
1）though, although引导的让步状语从句，后面的从句不能有but，但是 though 和yet可连用。例如：
Although it's raining, they are still working in the field.虽然在下雨，但他们仍在地里干活。
He is very old, but he still works very hard. 虽然他很老了，但仍然努力地工作。
Though the sore be healed, yet a scar may remain. 伤口虽愈合，但伤疤留下了。（谚语）
2） as, though 引导的让步从句必须表语或状语提前（形容词、副词、分词、实义动词提前）。例如：
Child as /though he was, he knew what was the right thing to do. 虽然是个小孩，该做什么不做什么，他全知道。
3） ever if, even though即使。例如：
We'll make a trip even though the weather is bad. 即使天气不好，我们也要去远足。
4） whether…or…不管……都。例如：
Whether you believe it or not, it is true. 信不信由你，这确实是真的。
5）"no matter +疑问词" 或"疑问词+后缀ever" 。例如：
No matter what happened, he would not mind. =Whatever happened, he would not mind. 不管发生什么，他不在意。
替换：no matter what = whatever
no matter who = whoever
no matter when = whenever
no matter where = wherever
no matter which = whichever
no matter how = however
注意：no matter 不能引导主语从句和宾语从句。8. 比较while, when, as
1）as, when 引导短暂性动作的动词。例如：
Just as / Just when / When I stopped my car, a man came up to me. 我一刹车，有一个人向我走来。
2）当从句的动作发生于主句动作之前，只能用when 引导这个从句，不可用as 或 while。例如： When you have finished your work, you may have a rest. 赶完活后，你可以休息一下。
3）从句表示"随时间推移"连词能用as，不用when 或while。例如：
As the day went on, the weather got worse.日子一天天过去，天气越变越坏。9.比较until和till
此两个连词意义相同。肯定形式表示的意思是"做某事直至某时"，动词必须是延续性的。否定形式表达的意思是"直至某时才做某事"。动词为延续性或非延续性都可以。正确使用这两个连词的关键之一就在于判断句中的动词该用肯定式还是否定式。肯定句：I slept until midnight. 我一直睡到半夜时醒了。
Wait till I call you. 等着我叫你。（在肯定句中可用before代替。例如 Let's get in the wheat before the sun sets.）
否定句：She didn't arrive until 6 o'clock. 她直到6点才到。
Don't get off the bus until it has stopped. 公共汽车停稳后再下车。
I didn't manage to do it until you had explained how. 直到你教我后，我才会做。
区别：1）until可用于句首，而till通常不用于句首。例如：
Until you told me, I had heard nothing of what happened. 直到你告诉我以前，出了什么事我一点也不知道。
2）until when 疑问句中，until要放在句首。例如：
---Until when are you staying?你呆到什么时候？
--- Until next Monday.呆到下周一。
注意：否定句可用另外两种句式表示。
1）Not until…在句首，主句用倒装。例如：
Not until the early years of the 19th century did man know what heat is. 直到19 世纪初，人类才知道热为何物。
Not until I began to work did I realize how much time I had wasted. 直到工作，才认识到我已蹉跎了几多岁月。
2）It is not until… that… 。例如：
It was not until I began to work that I realized how much time I had wasted.
10.表示"一…就…"的结构
hardly/scarcely…when/before, no sooner…than和as soon as都可以表示"一…就…"的意思。例如：
I had hardly / scarcely got home when it began to rain. 刚回家，就下起雨来了。
I had no sooner got home than it began to rain.
As soon as I got home, it began to rain.
注意：如果hardly, scarcely 或no sooner置于句首，句子必须用倒装结构。例如：
Hardly / Scarcely had I got home when it began to rain.
No sooner had I got home than it began to rain.定语从句 1.关系代词引导的定语从句1）who, whom, that 这些词代替的先行词是人的名词或代词，在从句中作主语和宾语。例如：
Is he the man who/that wants to see you? 他就是你想见的人吗？（who/that在从句中作主语）
He is the man whom/ that I saw yesterday. 他就是我昨天见的那个人。（whom/that在从句中作宾语）
2） whose 用来指人或物，（只用作定语, 若指物，它还可以同of which互换）。例如：
They rushed over to help the man whose car had broken down.那人车坏了，大家都跑过去帮忙。
Please pass me the book whose （of which） cover is green.请递给我那本绿皮的书。
3）which, that所代替的先行词是事物的名词或代词，在从句中可作主语、宾语等。例如：
A prosperity which / that had never been seen before appears in the countryside.
农村出现了前所未有的繁荣。（which / that在句中作宾语）
The package （which / that）you are carrying is about to come unwrapped. 你拿的包快散了。 （which / that在句中作宾语）
2.关系副词引导的定语从句 1）关系副词when, where, why的含义相当于"介词+ which"结构，因此常常和"介词+ which"结构交替使用。例如：
There are occasions when （on which） one must yield.任何人都有不得不屈服的时候。
Beijing is the place where（in which） I was born.北京是我的出生地。
Is this the reason why （for which） he refused our offer?这就是他拒绝我们帮助他的理由吗？
2）that代替关系副词，可以用于表示时间、地点、方式、理由的名词后取代when, where, why和"介词+ which"引导的定语从句，在口语中that常被省略。例如：
His father died the year （that / when / in which） he was born.他父亲在他出生那年逝世了。
He is unlikely to find the place （that / where / in which） he lived forty years ago. 他不大可 能找到他四十年前居住过的地方。
名词性从句
(一)主语从句类
I What he need is more time 2 Where she has gone is a mystery． (二)表语从句类The fact iS that she never liked him． The question is who can complete teh dificult task。(三)宾语从句类1．Do you know what they are doing? 2．It is a matter of who will hold the position．(四)同位语从句类 He has no idea what was the matter with him．
The news that his class got the first prize in the relay—is true．